Below are the amounts of XP needed for each hero levels. The values listed here are based on differences from the prior grade, not the initial grade.
You can either use heroes in combat to earn experience for them, or use XP potions.
| Level | R Grade | SR Grade | SSR & UR Grade |
|---|---|---|---|
 |
 |
  | |
| 1 | 9 | 10 | 11 |
| 2 | 30 | 36 | 42 |
| 3 | 71 | 89 | 107 |
| 4 | 140 | 179 | 219 |
| 5 | 245 | 316 | 392 |
| 6 | 394 | 511 | 639 |
| 7 | 595 | 775 | 974 |
| 8 | 856 | 1119 | 1411 |
| 9 | 1185 | 1552 | 1963 |
| 10 | 1590 | 2086 | 2643 |
| 11 | 2079 | 2731 | 3465 |
| 12 | 2660 | 3498 | 4442 |
| 13 | 3341 | 4397 | 5588 |
| 14 | 4130 | 5439 | 6917 |
| 15 | 5035 | 6634 | 8442 |
| 16 | 6064 | 7993 | 10177 |
| 17 | 7225 | 9527 | 12135 |
| 18 | 8526 | 11246 | 14329 |
| 19 | 9975 | 13161 | 16773 |
| 20 | 11580 | 15282 | 19481 |
| 21 | 13349 | 17620 | 22466 |
| 22 | 15290 | 20185 | 25742 |
| 23 | 17411 | 22988 | 29322 |
| 24 | 19720 | 26040 | 33220 |
| 25 | 22225 | 29351 | 37449 |
| 26 | 24934 | 32932 | 42023 |
| 27 | 27855 | 36793 | 46955 |
| 28 | 30996 | 40945 | 52259 |
| 29 | 34365 | 45399 | 57948 |
| 30 | 37970 | 50165 | 64036 |
| 31 | 41819 | 55254 | 70536 |
| 32 | 45920 | 60676 | 77462 |
| 33 | 50281 | 66442 | 84828 |
| 34 | 54910 | 72562 | 92647 |
| 35 | 59815 | 79047 | 100932 |
| 36 | 65004 | 85908 | 109697 |
| 37 | 70485 | 93155 | 118955 |
| 38 | 76266 | 100799 | 128720 |
| 39 | 82355 | 108850 | 139006 |
| 40 | 88760 | 117319 | 149826 |
| 41 | 95556 | 126305 | 161307 |
| 42 | 102757 | 135826 | 173472 |
| 43 | 110377 | 145901 | 186345 |
| 44 | 118430 | 156549 | 199950 |
| 45 | 126930 | 167789 | 214311 |
| 46 | 135892 | 179640 | 229452 |
| 47 | 145330 | 192121 | 245399 |
| 48 | 155260 | 205251 | 262176 |
| 49 | 165696 | 219051 | 279808 |
| 50 | 176653 | 233540 | 298321 |
| 51 | 188146 | 248738 | 317740 |
| 52 | 200191 | 264665 | 338091 |
| 53 | 212802 | 281342 | 359400 |
| 54 | 225996 | 298789 | 381693 |
| 55 | 239787 | 317027 | 404996 |
| 56 | 254192 | 336076 | 429336 |
| 57 | 269226 | 355957 | 454740 |
| 58 | 284906 | 376692 | 481234 |
| 59 | 301247 | 398301 | 508846 |
| 60 | 318265 | 420806 | 537602 |
| 61 | 335977 | 444228 | 567531 |
| 62 | 354399 | 468589 | 598659 |
| 63 | 373547 | 493911 | 631015 |
| 64 | 393438 | 520215 | 664626 |
| 65 | 414088 | 547523 | 699520 |
| 66 | 435514 | 575858 | 735726 |
| 67 | 457733 | 605241 | 773272 |
| 68 | 480762 | 635695 | 812186 |
| 69 | 504617 | 667242 | 852497 |
| 70 | 529316 | 699905 | 894234 |
| 71 | 554876 | 733706 | 937425 |
| 72 | 581313 | 768668 | 982100 |
| 73 | 608646 | 804814 | 1028288 |
| 74 | 636891 | 842166 | 1076018 |
| 75 | 666066 | 880748 | 1125319 |
| 76 | 696188 | 920583 | 1176221 |
| 77 | 727275 | 961694 | 1228754 |
| 78 | 759345 | 1004105 | 1282947 |
| 79 | 792415 | 1047838 | 1338831 |
| 80 | 826503 | 1092918 | 1396435 |